Half-Crazy Half-Demon

When you hear "half-demon," you probably imagine someone who is evil and satanic, or maybe even imagine someone who is the complete opposite. An example of that would be Raven, from Teen Titans. A half demon who fights crime, and whatever. Now, what if half demons were just like you? If they acted normal, were kind, and nobody would suspect a thing?
Ivy is this kind of demon. She was born this way, but she has no clue how. Both of her parents were human, and in order to be half demon, one of the parents must be a demon, but they were both were 100% human. Ivy was a normal teen, and was a teen who people thought she was going through her "emo phase." She is 15 years old, and no one picked on her because of her style. So she was just kind of... there. Not exactly an outcast, but also not particularly popular, either. She is also royal, and no one knows it besides her and her family. Rough life.